16. Which planets don’t have natural satellites?
a) Earth and Mars
b) Jupiter and Saturn
c) Mercury and Venus
d) Uranus and Neptune
Answer: c) Mercury and Venus
17. What type of celestial body is the Sun?
a) Planet
b) Star
c) Satellite
d) Asteroid
Answer: b) Star
18. Which layer of Earth contains minerals like iron, aluminum, and copper?
a) Core
b) Mantle
c) Crust
d) Atmosphere
Answer: c) Crust
19. The atmosphere acts as a:
a) Source of food
b) Protective blanket
c) Source of minerals
d) Source of water
Answer: b) Protective blanket
20. Which is the largest planet in our solar system?
a) Saturn
b) Jupiter
c) Uranus
d) Neptune
Answer: b) Jupiter
21. What makes the Earth unique in the solar system?
a) Its size
b) Its position
c) Presence of life
d) Its color
Answer: c) Presence of life
22. What is the region of Earth made up of liquid and solid water called?
a) Lithosphere
b) Atmosphere
c) Hydrosphere
d) Biosphere
Answer: c) Hydrosphere
23. The land area of Earth is called:
a) Hydrosphere
b) Lithosphere
c) Atmosphere
d) Biosphere
Answer: b) Lithosphere
24. Which gas is essential for respiration?
a) Nitrogen
b) Carbon dioxide
c) Oxygen
d) Water vapor
Answer: c) Oxygen
25. What is the main source of energy for plants to make their food?
a) Water
b) Air
c) Soil
d) Sunlight
Answer: d) Sunlight
26. What percentage of other gases (excluding Nitrogen and Oxygen) is present in air?
a) 1%
b) 21%
c) 78%
d) 50%
Answer: a) 1%
27. The total covering of air present around the Earth is called:
a) Hydrosphere
b) Lithosphere
c) Atmosphere
d) Biosphere
Answer: c) Atmosphere
28. Which of these is an artificial satellite?
a) Moon
b) Aryabhatta
c) Mars
d) Venus
Answer: b) Aryabhatta
29. What helps green plants remain in their position?
a) Air
b) Water
c) Soil
d) Light
Answer: c) Soil
30. Which state of water is found at the poles?
a) Liquid
b) Gas
c) Solid (Ice)
d) Water vapor
Answer: c) Solid (Ice)
